Importance of soccer players shifting with the ball (Defensive Movement).

How to Teach a Girl to Become an Aggressive Soccer Player.

If you Defend Deep and teach the player how to Clear the ball, you can put an unskilled player at Fullback, even if he is slow. BUT, you CANNOT put a timid or scared player at Fullback or you will get killed.

How to launch a soccer counterattack and score more goals against a Pushed Up team.

For a Fullback, you want what I call a "defender's personality".

Soccer is a physical game. It is greatly beneficial to teach your players at an early age (starting by U-10) that they must hustle and fight to "win the ball".